Graham Patrick Martin will appear in the season finale of the drama's first season. He is coming off of a six-season starring role on TNT's Major Crimes.

He will play Blake, an intoxicated college student who attempts to drop his injured friend Caden off at the emergency room and leave. He is stopped by the staff but unwilling to provide any information that may save Caden's life. It's eventually discovered they were involved in fraternity hazing that included taking ecstasy.

THE CW's SUPERGIRL

Angela Zhou has been cast in a recurring role on the drama's third season. She has previously had recurring roles on AMC's Hell on Wheels and Freeform's Stitchers.

She will play Dr. Grace Parker, a renowned surgeon in National City who has had quite a career in healing the sick and injured.